| Summary: | The research was conducted in the Jeringa site of the Turquino National Park in order to characterize the vegetation of a mountain forest fragment with Juglans jamaicensis. Floristic composition, vegetation structure, and the index value of importance were evaluated. Diameter at 1.30 m above the ground and height of all trees greater than 5 cm in diameter was measured. Data were analyzed using canonical correspondence analysis. 776 individuals of 43 species and 41 genera belonging to 30 families, reporting the Rubiaceae family as the richest in species, followed by Amigdalaceae, Araliaceae, Cyatheaceae, Euphorbiaceae, Flacourtiaceae, Meliaceae, Moraceae, Sapindaceae and Poaceae. The tree species with more IVI were the Pseudolmedia spuria, Oxandra laurifolia, Trophis racemosa, Ocotea leucoxylon, Guarea guara, Dendropanax arboreus and Juglans jamaicensis, mainly due to its abundance in the vegetation, but it was found that the main contributor to the organic weight parameter species was the relative frequency.
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